Pact Warding

When Pact Warding enters the battlefield, each
player chooses a creature they control. Put a pact
counter on each creature chosen that way.
When a player controls no creatures with pact
counters on them, sacrifice Pact Warding.
Creatures that share a type with a creature
with a pact counter on it can't attack or block.
"Peace often hangs by a thread: friendship."